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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Influence of ceria addition on thermal properties and local structure of bismuth germanate glasses
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Influence of ceria addition on thermal properties and local structure of bismuth germanate glasses

机译：添加二氧化铈对锗酸铋玻璃的热性能和局部结构的影响

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摘要

Bismuth germanate glasses are interesting materials due to their physical properties and their unique structural characteristics caused by the coordination changes of bismuth and germanium atoms. Glasses of the bismuth germanate system were prepared by melting/molding method and were investigated concerning their thermal and structural properties. The structural analysis of the samples was carried out by micro-Raman and Fourier transform infrared spectroscopes. It was observed that the glass structure is formed basically by GeO4 tetrahedral units also having the formation of the GeO 6 octahedral units. BiO2 was considered a network former by observing the presence of octahedral BiO6 and pyramidal BiO 3 groups in the local structure of the samples. An absorption band observed at 1103 cm-1 in the IR spectrum of the undoped glass was attributed to the Bi-O-Ge and/or Bi-O-Bi linkage vibration. The said band shifted to lower wavenumbers after the CeO2 addition thus reflecting changes in the glass network. Cerium oxide was an efficient oxidant agent to prevent the darkening of the glasses which was probably associated to the reduction of Bi ions. However, CeO2 was incorporated as a local network modifier in the glass structure even at concentrations of 0.2 mol%.
机译：由于铋和锗原子的配位变化而引起的物理性质和独特的结构特征，锗酸铋玻璃是有趣的材料。通过熔融/模塑法制备锗酸铋系统的玻璃，并对其热性能和结构性能进行了研究。样品的结构分析通过微拉曼和傅立叶变换红外光谱仪进行。观察到玻璃结构基本上由GeO 4四面体单元形成，GeO 4四面体单元也具有GeO 6八面体单元的形成。通过观察样品局部结构中八面体BiO6和金字塔形BiO 3基团的存在，BiO2被认为是网络形成物。未掺杂玻璃的红外光谱中在1103 cm-1处观察到的吸收带归因于Bi-O-Ge和/或Bi-O-Bi连锁振动。添加CeO2后，所述带移至较低的波数，从而反映了玻璃网络的变化。氧化铈是防止玻璃变黑的有效氧化剂，这可能与Bi离子的还原有关。然而，即使浓度为0.2mol％，CeO 2也作为局部网络改性剂掺入玻璃结构中。

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